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I asked my friend, a mechanic at the service department of the local Toyota dealer, he says there probably is a loose ground somewhere. Test sockets for voltage. Test from positive side of socket to frame of your truck. If voltage there then test between both wires going to socket if no voltage this way then bad ground. If no voltage either way then probably bad fuse, relay or switch. It is difficult to diagnose a problem when you don't have the vehicle to test.

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